Good news. There's an archival site for working NSFW links that was set up yesterday, already added Poltergeist to it myself, over 500 links and rising as we speak. loop-io.dev is the link for it.
Know the feeling, joined back in early December last year, MPP was one of the first games I tried. Put every last game I had a link to on the list, so I can tell you there's at least 380+ games that are of middling to top shelf quality there, with Poltergeist easily belonging to the latter in terms of narrative.
Some of my top recommendations would probably be Crimson High, Corrupted Kingdoms, My Time With You, Demons of the Hearth, Secret Island, Monster Girl Dreams, Growth Academy (expansion kinks if you're ok with that, but fucking phenomenal stories and characters even if it isn't your thing), School of Love: Clubs, How I Became the Bodyguard of the Saintess, Find Love or Die Trying, Spunkstock, Broken Dreams, AI Revolution, Long and Hard Summer, Winds of the Destiny, Monster Girl 1000, Learn the Heart, Crossworlds, Dimension 69, Lustful Sin, My Maid Dreams of Electric Sheep, Land of Embers, Afterlife Harem, Goddesses' Whim, Harem Residence, Lost In You, Displaced, Inn Another World, Guild of Spicy Adventures, Lessons In Love, Thou Eternal Everbloom, Traveler's Inn Tales, Ramen no Oujisama, Ilias: Alcyone Legends, and Android Life. Not in that particular order, just listed everything that came to mind, and it might not even be everything I could recommend.
Edit: Missed several that I wanted to include in the original post. Mentor Life, My Dystopian Robot Girlfriend, A New Place, Quest Failed 1 and 2, Her New Memory, Hero's Harem Guild, Lewd Lore: Isekai Fantasy, Welcum To The City, Con Quest, Greener Pastures, and Dreamland Wanderer.